linux-kernel - [PATCH v4 08/14] virt: gunyah: msgq: Add hypercalls to send and receive messages

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Date:   Wed, 28 Sep 2022 12:56:27 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
CC:     Elliot Berman <quic_eberman@...cinc.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Srivatsa Vaddagiri" <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        "Will Deacon" <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Arnd Bergmann" <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 08/14] virt: gunyah: msgq: Add hypercalls to send and receive messages

Add hypercalls to send and receive messages on a Gunyah message queue.

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 arch/arm64/gunyah/hypercall.c | 33 +++++++++++++++++++++++++++++++++
 include/asm-generic/gunyah.h  |  5 +++++
 2 files changed, 38 insertions(+)

diff --git a/arch/arm64/gunyah/hypercall.c b/arch/arm64/gunyah/hypercall.c
index 5b08c9d80de0..042cca31879e 100644
--- a/arch/arm64/gunyah/hypercall.c
+++ b/arch/arm64/gunyah/hypercall.c
@@ -26,6 +26,8 @@
 							| ((fn) & GH_CALL_FUNCTION_NUM_MASK))
 
 #define GH_HYPERCALL_HYP_IDENTIFY		GH_HYPERCALL(0x0000)
+#define GH_HYPERCALL_MSGQ_SEND			GH_HYPERCALL(0x001B)
+#define GH_HYPERCALL_MSGQ_RECV			GH_HYPERCALL(0x001C)
 
 /**
  * gh_hypercall_get_uid() - Returns a UID when running under a Gunyah hypervisor.
@@ -67,5 +69,36 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi
 }
 EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify);
 
+int gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, bool *ready)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff, tx_flags, 0, &res);
+
+	if (res.a0)
+		return res.a0;
+
+	*ready = res.a1;
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send);
+
+int gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, bool *ready)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0, &res);
+
+	if (res.a0)
+		return res.a0;
+
+	*recv_size = res.a1;
+	*ready = res.a2;
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls");
diff --git a/include/asm-generic/gunyah.h b/include/asm-generic/gunyah.h
index 86eb59e203ef..43915faea704 100644
--- a/include/asm-generic/gunyah.h
+++ b/include/asm-generic/gunyah.h
@@ -107,4 +107,9 @@ struct gh_hypercall_hyp_identify_resp {
 void gh_hypercall_get_uid(u32 *uid);
 void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity);
 
+#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH		BIT(0)
+
+int gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, bool *ready);
+int gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, bool *ready);
+
 #endif
-- 
2.25.1